Experiment1 Natural Radioactivity CHEM 151 PRE-LAB ASSIGNMENT Name: 1. Define the following terms: a. radioactivity b. background radiation c. isotope d. beta emission e. positron emission f. electron capture g. half-life 2. Write nuclear equations that describe the three decay modes for potassium- 40. 3. Write mathematical equations that show how you will calculate the detected activity from the count rate due to background radiation and the sample of KCI. Also, write an equation that shows how you will determine the "true" activity of your sample. Use the following terms: Rback-count rate for background radiation Rtot = total count rate detected from your sample and the background =detected count rate from your sample less the background radiation Rtrue = the corrected count rate for inefficiencies in the counting procedure, or the "true" count rate. R